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The Encyclopaedia of Cereal Diseases

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The Encyclopaedia of Cereal Diseases The encyclopaedia of cereal diseases How to use this encyclopaedia This publication provides easy reference to the diseases of UK cereals and the pathogens responsible (the causal organisms). The diseases are ordered alphabetically by common name (including variants), from ascochyta leaf scorch to yellow rust. The pathogens responsible are also listed alphabetically at the back of the encyclopaedia (alongside the common names). Both the teleomorph (sexual stage) and anamorph (asexual stage) are listed, when appropriate. A simple glossary of technical terms can also be found at the end of the encyclopaedia. For each disease, the pages are structured in a similar way. The common name features at the top of each page. A blue box includes the pathogen responsible and the hosts affected. Where fungal pathogens have both a teleomorph and an anamorph, the teleomorph is listed first, with the anamorph in brackets. There then follows a more detailed description of the disease under the following headings; Hosts, Symptoms, Life cycle, Importance. This is complemented by photographs, as appropriate. The Chemical Company Cover image: Scanning EM image of yellow rust pustule (Puccinia striiformis). Copyright© Rothamsted Research Ltd (Centre for Bioimaging). Contents 2 How to use this encyclopaedia 59 Powdery mildew 5 Introduction 63 Ramularia leaf spot 6 Ascochyta leaf scorch (spot) 65 Rhizoctonia stunt 8 Barley yellow dwarf virus 67 Rhynchosporium (leaf scald) (BYDV) 69 Septoria tritici (septoria leaf 10 Black point blotch) 12 Black (stem) rust 71 Sharp eyespot 14 Brown (leaf) rust 73 Snow mould (pink snow mould) 17 Bunt or stinking smut 75 Snow rot (grey or speckled snow mould) 19 Cephalosporium leaf stripe 77 Sooty moulds 21 Covered smut 79 Stripe smut 23 Crown rust 81 Take-all 25 Dwarf bunt 83 Tan spot (DTR) 27 Ergot 85 Yellow (stripe) rust 30 Eyespot 88 Glossary 34 Flag smut 92 Index 36 Foot rot 95 Further information 38 Fusarium (foot rot, seedling blight, ear/head blight) 42 Halo spot 44 Leaf and glume blotch 47 Leaf spot 49 Leaf stripe 51 Loose smut 53 Mosaic viruses 55 Net blotch 57 Omphalina patch 3 Introduction The need to deliver consistent, high The production of this encyclopaedia yields of high quality grain makes was very much a team effort, bringing control of cereal diseases an together Bill Clark of Broom’s Barn important component of successful Research Centre (now at NIAB), who crop management. Recognition of the wrote the text, with Rosie Bryson and disease, and an understanding of the Lindy Tonguç of BASF and Clare Kelly pathogen(s) responsible, is the first and Graham Jellis from AHDB, who step in successful disease control. editied and formatted it. The This encyclopaedia was produced to publication was funded by BASF and help the grower, adviser and others AHDB Cereals & Oilseeds. We hope involved in cereal production you find it interesting and informative. recognise diseases and learn something about them. Symptoms of both common and less frequently found diseases are illustrated and described, together with an outline of the disease cycle of the pathogen and an indication of the importance of the disease. This encyclopaedia is not intended to be a guide to disease control. Such information is readily available elsewhere, for example the principles of wheat disease management can be found in the Wheat disease management guide and current information on fungicide performance is published annually on the AHDB website. 5 Ascochyta leaf scorch (spot) Pathogen: Didymella exitialis (Ascochyta spp.) Wheat Barley Oats Rye Triticale Hosts Importance The disease affects wheat, barley, The disease is of relatively minor oats, rye, triticale and many grass importance although in individual species. crops it is likely to add to leaf death in the same way as the septoria Symptoms diseases. Disease symptoms are found on Symptoms are often seen later in the lower leaves early in the season and season towards the end of grain on upper leaves later on. The lesions filling when they are unlikely to cause are usually elliptical and although any yield loss. The teleomorph stage chlorotic at first, soon become buff to of the fungus (Didymella exitialis) is brown in colour, often splitting common in Europe and the air-borne longitudinally. Initially lesions have a ascospores of the fungus are dark brown margin with a papery commonly found in late summer in white centre. The fungus often the UK, where they have been invades damaged leaf tissue such as implicat ed in late summer asthma. that caused by liquid urea or nitrogen. Symptoms become less distinct with time and become very similar to those caused by S.nodorum. Pycnidia within the lesions are generally black, distin guishing the disease from S. nodorum which tends to have light coloured pycnidia. Life cycle Pycnidia and mycelium within leaf tissue are thought to survive on crop debris, much like the septoria pathogens. Typical ascochyta lesion showing dark margin and black pycnidia 6 Ascochyta leaf scorch (spot) Typical ascochyta symptoms on wheat leaves Brown lesions occur Perithecia and on older leaves pycnidia develop Leaves become infected within lesions by rain splash or as air-borne ascospores Pycnidia (rain splash) Ascopores Pycnidiospores are released from pycnidia Perithecia (wind blown) Overwinters as mycelium and pycnidia in host debris Ascochyta leaf scorch (spot) life cycle 7 7 Barley yellow dwarf virus (BYDV) Virus: Barley yellow dwarf virus (BYDV) Wheat Barley Oats Rye Triticale Hosts plants. BYDV is most damaging to The disease affects all cereals and plants infected at early growth grasses. Barley and oats are usually stages; plants can be killed by very more severely affected than wheat. early infections. The effects of BYDV may be exacerbated by other stress Symptoms factors such as adverse weather conditions, soil acidity and other The initial symptoms of BYDV pests and diseases. infection are normally seen as indi vidual plants with bright yellow Life cycle upper leaves scattered through the crop. Later, as infection spreads, BYDV became much more impor tant larger areas of the crop become and widespread with the increase in infected, appearing as patches of early-drilling of winter cereals. The bright yellow and severely stunted virus exists as several strains and is transmitted by various species of cereal aphid. The bird-cherry aphid (Rhopalosiphum padi) is the principal vector in the south of England. In the north of England and in the Midlands the grain aphid (Sitobion avenae) is usually more important. In the autumn, BYDV can be introduced into cereal crops in two ways: 1. Direct transfer by wingless aphids living on grass or on vol unteer cereals which survive cul tivation and move through the soil colonising the following cereal crop. This is much more common in coastal areas of the south west Wheat plants showing yellowing and red where cereals may follow grass tipping of upper leaves and winters can be mild. 8 Barley yellow dwarf virus (BYDV) 2. Indirect transfer by winged aphids migrating into newly emerged crops from grass or vol unteer cereals elsewhere. BYDV introduced by winged aphids fly ing into crops is generally much more common and important than BYDV resulting from direct transfer. Importance With the now common practice of sowing winter barley very early, BYDV has increased in importance in many areas of the UK. The fre quency of very mild winters has also meant that, for many farms, BYDV is now a regular problem. Early infections can kill patches of plants potentially resulting in large yield losses. BYDV infected patch in a wheat field Affected plants with Individual plants and small yellow and reddish patches affected leaves and stunting Winged aphids spread virus to other plants Winged aphids Direct transfer from grass (wingless aphids) Overwinters in grasses and volunteers BYDV life cycle 9 Black point Pathogen: Alternaria spp. and Cladosporium spp. Wheat Barley Oats Rye Triticale Hosts grain can lead to poor flour and bran The disease can affect all cereal colour, and rejection on the basis of species although wheat and barley discoloured grains. Durum wheat are most commonly affected. The seems to be particu larly susceptible. same fungi can cause discolouration The disease is commonly reported to of oats. be more severe on larger grains, so high specific weight grain can have a Symptoms higher incidence. This is thought to Symptoms are only visible after be due to the larger grains producing harvest. Affected grain shows a a more open flo ret, allowing fungal darkening of the outer coat spores greater access to the germ particularly at the embryo end of end of the grain. the grain. Life cycle The disease is associated with a number of airborne fungi including Alternaria spp. and Cladosporium spp. although the evidence for these fungi actually causing the dis ease is still limited and is mainly circumstantial. High humidity or frequent rainfall from the milky ripe to soft dough stage and lodging can often trigger infection by these fungi. Importance The disease has no significant effect on yield but can have serious implications for the quality of milling wheat, barley and oats for processing. The discolouration of the Darkening of grain at the germ end 10 Black point Conidia infect ears post GS 75 Dark brown discolouration at embryo end of grain Air-borne conidia Cladosporium Seed infection can cause Alternaria poor germination Overwinters on crop debris and vegetation Black point life cycle 11 Black (stem) rust Pathogen: Puccinia graminis f.sp. tritici Wheat Barley Oats Rye Triticale Hosts Life cycle Puccinia graminis f.sp. tritici is The fungus develops teliospores on spe cific to wheat. the wheat plant which produce a secondary spore, the basidiospore. Symptoms This spore infects a completely different host – the barberry Despite its name, the characteristic (Berberis spp.).
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